一维钴(Ⅱ)/镍(Ⅱ)配位聚合物的合成、结构、磁性及荧光传感性质

Synthesis,structures,magnetic and fluorescent sensing properties of 1D Co(Ⅱ)􀃭/Ni(Ⅱ)􀃭coordination polymers

采用水热法合成了2个新的配位聚合物[Co(L)_(0.5)(1,4-bib)(H_(2)O)_(3)]n(1)和[Ni(L)_(0.5)(1,4-bib)(H_(2)O)_(3)]n(2)(H_(4)L=1,4-二(2,6-二甲基-3,5-二羧基吡啶基)苯,1,4-bib=1,4-双(1-咪唑基)苯),通过X射线单晶及粉末衍射、元素分析、红外光谱分析和热重分析对其结构进行表征。结构分析表明配合物1和2为异质同构,均为一维结构。通过变温磁化率测量发现,配合物1和2中的Co􀃭/Ni􀃭离子之间存在反铁磁相互作用。此外,配合物1可通过荧光猝灭法检测头孢克肟(CEF),配合物2可用来检测四环素(TET),该方法灵敏度高、选择性好,其检出限分别为0.86μmol·L^(-1)(CEF)和0.49μmol·L^(-1)(TET)。

Two new coordination polymers[Co(L)_(0.5)(1,4-bib)(H_(2)O)_(3)]n(1)and[Ni(L)0.5(1,4-bib)(H_(2)O)_(3)]n(2)(H_(4)L=1,4-bis(2,6-dimethyl-3,5-dicarboxypyridyl)benzene,1,4-bib=1,4-bis(1-imidazolyl)benzene)were synthesized by hydrothermal method.Their structures were characterized by single crystal and powder X-ray diffraction,elemental analysis,infrared spectroscopic analysis,and thermogravimetric analysis.Structural analysis shows that complexes 1 and 2 are heterogeneous isomorphisms and 1D structures.The antiferromagnetic interaction between Co(Ⅱ)/Ni(Ⅱ)ions in complexes 1 and 2 was found by variable temperature magnetic susceptibility measurement.In addition,complex 1 can be used to detect cefixime(CEF)by fluorescence quenching method,and complex 2 can be used to detect tetracycline(TET).This method had high sensitivity and good selectivity,and their detection limits were 0.86μmol·L^(-1)(CEF)and 0.49μmol·L^(-1)(TET),respectively.CCDC:2201063,1;2201064,2.